The film begins in a bus that has a lot of college students heading towards Government Arts College in a small town. A set of friends are introduced as long term friends. There is a small build up to the introduction of the hero (Muthu played by newcomer Akil), who is part and parcel of the circle. All are studying in the same class. They enter into the college for the first time.
50 years from now the sun is dying and life on earth is threatened by arctic temperatures. Mankind puts together all its resources and sends a spaceship carrying a huge bomb designed to re-ignite the dying sun.
Three American brothers who have not spoken to each other in a year set off on a train voyage across India with a plan to find themselves and bond with each other -- to become brothers again like they used to be.